CN104112909A - Diversity antenna combination and broadband antenna capable of dynamically adjusting input impedance - Google Patents

Abstract

A diversity antenna combination and a broadband antenna that can dynamically adjust input impedance. The broadband antenna with dynamically adjustable input impedance includes a ground plane, a radiating unit and an impedance adjustment chip. The ground plane is used to provide a reference ground potential and includes an edge. The radiating unit includes: a first radiating element provided with a signal feed point spaced adjacent to an edge of the ground plane; and a second radiating element physically isolated from the first radiating portion and having a free end. The impedance adjustment chip has: a first signal transmission end and a second signal transmission end, which are electrically connected to the first radiating element and the second radiating element respectively, and the impedance adjustment chip can receive a control signal and adjust the signal according to the control signal. The signal is used to change a reactance value between the first signal transmission end and the second signal transmission end.

Description

Diversity Antenna Combination and Its Broadband Antenna with Dynamically Adjustable Input Impedance

technical field

The invention relates to an antenna combination and its antenna, in particular to a diversity antenna combination and a broadband antenna capable of dynamically adjusting input impedance.

Background technique

Referring to FIG. 1, FIG. 1 shows a diversity antenna combination of US Patent No. US6483463, which includes a first inverted-F antenna and a second inverted-F antenna operating in the same frequency band.

The disadvantages of this diversity antenna combination are:

1. The input impedances from the input ends 111 and 121 of the first inverted-F antenna 11 and the second inverted-F antenna 12 are fixed, so they cannot be dynamically adjusted for different usage environments.

2. The first inverted-F antenna 11 and the second inverted-F antenna 12 are three-dimensional structures, the manufacturing and assembly costs are relatively high, and because assembly is required, the yield rate is low, and they are not suitable for thin electronic devices. Products such as Universal Serial Bus (USB) devices.

Contents of the invention

Therefore, an object of the present invention is to provide a broadband antenna capable of dynamically adjusting input impedance.

Therefore, the broadband antenna capable of dynamically adjusting the input impedance of the present invention includes a ground plane, a radiation unit, an impedance adjustment chip and an input matching unit.

The ground plane is used to provide a reference ground potential and includes an edge.

The radiation unit includes a first radiation element and a second radiation element. The first radiating element is provided with a signal feeding point adjacent to the edge of the ground plane at intervals. The second radiating element is physically isolated from the first radiating part and has a free end.

The impedance adjustment chip includes a first signal transmission end and a second signal transmission end. The first signal transmission end and the second signal transmission end are electrically connected to the first radiating element and the second radiating element respectively, and the impedance adjustment chip can receive a control signal and change the first signal according to the control signal. A reactance value between the signal transmission end and the second signal transmission end.

The input matching unit includes an inductor and a capacitor. The inductor has a first end for receiving a radio frequency signal, and a second end electrically connected to the signal feeding point. The capacitor has a first end electrically connected to the second end of the inductor, and a second end electrically connected to the ground plane.

Moreover, an electrical length from the first radiating element, the impedance adjustment chip to the free end of the second radiating element is used as a resonant path of the broadband antenna.

Yet another object of the present invention is to provide an antenna combination.

The antenna combination includes a ground plane, the two aforementioned radiation units, the two aforementioned impedance adjustment chips and the two aforementioned input matching units.

The ground plane is used to provide a reference ground potential and includes two edges.

The radiating units are respectively adjacent to the edges at intervals, and the radiating units are mirror-symmetrical to each other on a mirroring line, and are separated from the mirroring line by a distance, and the edges are respectively located on two opposite sides of the mirroring line.

The impedance adjustment chips are respectively electrically connected to the radiation units.

The input matching units are respectively electrically connected to the radiation units.

Description of drawings

Other features and effects of the present invention will be clearly presented in the implementation manner with reference to the accompanying drawings, wherein:

Fig. 1 is a kind of existing diversity antenna combination;

Fig. 2 is a schematic diagram illustrating a preferred embodiment of the present invention having a broadband antenna with dynamically adjustable input impedance;

3 to 7 are each a schematic circuit diagram illustrating the implementation of an impedance adjustment chip of the preferred embodiment;

FIG. 8 is a schematic circuit diagram illustrating an implementation of an input matching unit of the preferred embodiment;

Figure 9 is a schematic diagram illustrating a preferred embodiment of the antenna combination of the present invention; and

FIG. 10 is a VSWR diagram of the preferred embodiment of the antenna combination.

Description of reference symbols

11··························································

111·············· Input

12···············Second Inverted-F Antenna

121············ Input

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313············Feed arm

314···········Connecting arm

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32···············Second Radiating Element

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322············Connecting arm section

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51··············································Inductance

52··············Capacitance

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Detailed ways

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same numerals.

Referring to FIG. 2 , a preferred embodiment of the broadband antenna capable of dynamically adjusting the input impedance of the present invention includes a ground plane 2 , a radiation unit 3 , an impedance adjustment chip 4 , an input matching unit 5 and a substrate 6 .

The ground plane 2 is used to provide a reference ground potential, and includes an edge 21 extending substantially parallel to a first direction (XY).

The radiation unit 3 includes a first radiation element 31 and a second radiation element 32 .

The first radiating element 31 is provided with a signal feeding point 311 spaced adjacent to the edge of the ground plane for sending and receiving a radio frequency signal, and has a shorting arm 312 , a feeding arm 313 , and a connecting arm 314 .

The shorting arm 312, the feeding arm 313 and the connecting arm 314 are substantially electrically connected in an E shape, and the two openings 315, 316 of the E shape face the edge 21 of the ground plane 2, and the feeding arm 313 is between these openings 315,316.

The second radiating element 32 is a long bent arm and physically isolated from the first radiating part 31, and has a free end 321, a connecting arm segment 322, a first segment 323, a second segment 324, A third section 325 , a fourth section 326 and a fifth section 327 .

The connecting arm segment 322 is electrically connected to the second signal transmission end 42 .

The first section 323 is bent from the connecting arm section 322 and extends substantially parallel to the first direction (XY).

The second section 324 is bent from the first section 323 and extends substantially parallel to a second direction (Y), and the connecting arm section 322, the first section 323 and the second section 324 are substantially The ground connection is in a Z shape.

The third section 325 is electrically connected to the second section 324 and extends substantially parallel to a third direction (X), and the second direction (Y) is substantially perpendicular to the third direction (X).

The fourth section 326 is bent from the third section 325 and extends to the free end 321, and extends substantially parallel to the first direction (XY), and in the second direction (Y), the fourth section The portion 326 overlaps between the third segment portion 325 and the first radiating element 31 , and is spaced apart from the first radiating element 31 to generate a capacitive coupling effect for frequency reduction.

The fifth section 327 extends substantially parallel to the first direction (XY), and has two ends electrically connected to the second section 324 and the third section 325 respectively.

The impedance adjustment chip 4 includes a first signal transmission end 41 , a second signal transmission end 42 , N switch points 43 , N−2 reactance elements 44 and a switch arm 45 . Wherein, the parameter N is a positive integer greater than 2.

The first signal transmission end 41 and the second signal transmission end 42 are respectively electrically connected to the first radiating element 31 and the second radiating element 32, and the impedance adjustment chip 4 can receive a control signal, and according to the control signal Change a reactance value between the first signal transmission end 41 and the second signal transmission end 42, and, from the first radiation element 31, the impedance adjustment chip 4 to the free end 321 of the second radiation element 32 An electrical length is used as a resonant path of the broadband antenna.

Referring to FIG. 3 , FIG. 3 shows the first implementation of the impedance adjustment chip 4 , and for convenience of description, N=5, that is, five switching points 43 and three reactance elements 44 are taken as an example.

Two of the five switching points 43 are kept short-circuited and open-circuited with the first signal transmission end 41 respectively.

Each reactance element 44 is a fixed capacitor, and has a first end electrically connected to the first signal transmission end 41 , and a second end serving as a switching point 43 .

The switching arm 45 has a fixed end electrically connected to the second signal transmission end 42, and a switching end electrically connected to one of the switching points 43, and the switching arm 45 controls the switching end according to the control signal It is electrically connected to one of these switching points 43 .

Referring to FIG. 4 , FIG. 4 shows a second implementation of the impedance adjustment chip 4 , which is similar to the first implementation, except that each reactance element 44 is a fixed inductor.

Referring to Fig. 5, Fig. 5 shows the third implementation of the impedance adjustment chip 4, which is similar to the first implementation, the difference is: N=6, and the four (N-2) reactance elements 44 are Two fixed inductors and two fixed capacitors.

Referring to Fig. 6, Fig. 6 shows the fourth implementation of the impedance adjustment chip 4, which is similar to the first implementation, the difference is: N=3, and the (N-2) reactance element 44 is a Variable capacitance.

Referring to FIG. 7 , the fifth embodiment of the impedance adjustment chip 4 is similar to the fourth embodiment, the difference is that the reactance element 44 is a variable inductor.

Referring to FIG. 8 , the input matching unit 5 includes an inductor 51 and a capacitor 52 .

The inductor 51 has a first end for receiving a radio frequency signal, and a second end electrically connected to the signal feeding point 311 . The capacitor 52 has a first end electrically connected to the second end of the inductor 51 , and a second end electrically connected to the ground plane 2 .

Referring back to FIG. 2 , the substrate 6 includes a surface 61 , and the ground plane 2 and the radiation unit 3 are disposed on the surface 61 of the substrate 6 . For example: the substrate is a glass fiber board, the ground plane 2 and the radiation unit 3 are formed by etching a copper layer glued on the surface 61 .

Referring to FIG. 9 , a preferred embodiment of the antenna combination of the present invention includes the aforementioned ground plane 2 , the aforementioned two aforementioned radiation units 3 , the aforementioned two aforementioned impedance adjustment chips 4 and the aforementioned two aforementioned input matching units 5 .

The ground plane 2 also includes a further edge 22 .

These radiating units 3 are spaced adjacent to these edges 21, 22 respectively, and these radiating units 3 are mirror-symmetrical to each other on a mirror image line 7, and each is separated from the mirror image line 7 by a distance, and these edges 21, 22 are respectively located on the mirror image line Two opposite sides of 7.

The impedance adjustment chips 4 are electrically connected to the radiation units 3 respectively.

The input matching unit 5 is electrically connected to the radiation units 3 respectively. And the electrical connection between each radiating unit 3 and the impedance adjustment chip 4 and the input matching unit 5 is the same as the description of the preferred embodiment of the broadband antenna capable of dynamically adjusting the input impedance.

Referring to Figure 10, Figure 10 shows the two voltage standing wave ratio curves of the antenna combination, and the measurement point is the first end of the inductance 51 of the two equal-input matching units 5 (see Figure 8), which shows : 1. It is dual-mode resonance; and 2. Defined by VSWR < 3, each radiating unit 3 in this preferred embodiment cooperates with the input matching unit 5 to have a broadband effect of 850 MHz.

In summary, the foregoing preferred embodiments have the following advantages:

1. The radiation unit 3 has an adjustable input impedance of the signal feeding point 311 through the impedance adjustment chip 4, so it can be adjusted dynamically corresponding to different usage environments.

2. The ground plane 2 and the radiation unit 3 are both located on the two-dimensional surface 61 of the substrate 6, and the impedance adjustment chip 4 and the input matching unit 5 can be quickly and accurately fixed on the substrate 6 by surface-mounting technology Therefore, the manufacturing and assembly costs are low, the yield rate is high, and it is suitable for thin electronic products.

In summary, the aforementioned preferred embodiments can indeed achieve the purpose of the present invention.

The above description is only a preferred embodiment of the present invention, and should not limit the scope of the present invention with this, that is, all simple equivalent changes and modifications made according to the claims of the present invention and the contents of the patent specification are still within the scope of the present invention. Within the scope covered by the patent of the present invention.

Claims (10)

1. A broadband antenna capable of dynamically adjusting input impedance, comprising: a ground plane (2), used to provide a reference ground potential, and includes an edge (21); A radiation unit (3), comprising: a first radiating element (31), provided with a signal feeding point (311) spaced adjacent to the edge of the ground plane; and a second radiating element (32), physically isolated from the first radiating part (31), and having a free end (321); as well as An impedance adjustment chip (4), including: A first signal transmission terminal (41) and a second signal transmission terminal (42), respectively electrically connected to the first radiation element (31) and the second radiation element (32), and the impedance adjustment chip (4) can receiving a control signal, and changing a reactance value between the first signal transmission end (41) and the second signal transmission end (42) according to the control signal; Moreover, an electrical length from the first radiation element (31), the impedance adjustment chip (4) to the free end (321) of the second radiation element (32) is used as a resonance path of the broadband antenna. 2. the broadband antenna that can dynamically adjust input impedance as claimed in claim 1, wherein, this impedance adjustment chip (4) also has: N switching points (43), and N is a positive integer greater than 2, two of these switching points (41) are kept short-circuited and open-circuited with the first signal transmission end (41) respectively; N-2 reactance elements (44), each reactance element (44) is selected from a fixed capacitance or a fixed inductance, and has a first end electrically connected to the first signal transmission end (41), and a the second end of the switching point; and A switching arm (45) has a fixed end electrically connected to the second signal transmission end (42), and a switching end electrically connected to one of these switching points (43), and the switching arm (45) is According to the control signal, the switching terminal is controlled to be electrically connected to one of the switching points (43). 3. the broadband antenna that can dynamically adjust input impedance as claimed in claim 1, wherein, this impedance adjustment chip (4) also has: N switching points (43), and N is a positive integer greater than 2, two of these switching points (41) are kept short-circuited and open-circuited with the first signal transmission end (41) respectively; N-2 reactance elements (44), each reactance element (44) is selected from variable capacitance or variable inductance, and has a first end electrically connected to the first signal transmission end (41), and a as a second end of the switching point; and A switching arm (45) has a fixed end electrically connected to the second signal transmission end (42), and a switching end electrically connected to one of these switching points (43), and the switching arm (45) is According to the control signal, the switching terminal is controlled to be electrically connected to one of the switching points (43). 4. The broadband antenna capable of dynamically adjusting input impedance as claimed in claim 1, wherein the first radiating element (31) has: a short-circuit arm (312), protruding from the ground plane (2); a feed-in arm (313), spaced from the short-circuit arm (312), and used to set the signal feed-in point (311); and A connecting arm (314), electrically connected to the short arm (312), the feeding arm (313) and the first signal transmission end (41). 5. The broadband antenna capable of dynamically adjusting input impedance as claimed in claim 4, wherein the short-circuit arm (312), the feeding arm (313) and the connecting arm (314) are substantially electrically connected in an E shape, And the two openings of the E-shape are facing the edge (21) of the ground plane (2), and the feeding arm (313) is interposed between the two openings of the E-shape. 6. The broadband antenna capable of dynamically adjusting input impedance as claimed in claim 1, wherein the edge (21) of the ground plane (2) extends substantially parallel to a first direction (XY), and the second radiating element (32 ) is a long bent arm, and also has: a connecting arm segment (322), electrically connected to the second signal transmission end (42); and a first section (323), bent from the connecting arm section (322), and extending substantially parallel to the first direction (XY); a second section (324), bent from the first section (323), and extending substantially parallel to a second direction (Y); A third section (325), electrically connected to the second section (324), and extending substantially parallel to a third direction (X), and the second direction (Y) is substantially perpendicular to the third direction ( X); and a fourth section (326), bent from the third section (325) and extending to the free end (321), and extending substantially parallel to the first direction (XY), and the second direction (Y ) is substantially perpendicular to the third direction (X), and in the second direction (Y), the fourth section (326) overlaps the third section (325) and the first radiating element ( 31) and spaced apart from the first radiating element (31). 7. The broadband antenna capable of dynamically adjusting input impedance as claimed in claim 6, wherein the second radiating element (32) also has: A fifth segment (327) extends substantially parallel to the first direction (XY), and has two ends electrically connected to the second segment (324) and the third segment (325) respectively. 8. The broadband antenna capable of dynamically adjusting input impedance as claimed in claim 6, wherein, the connecting arm section (322), the first section (323) and the second section (324) are substantially connected to form a Z-shaped. 9. The broadband antenna capable of dynamically adjusting input impedance as claimed in claim 1, further comprising an input matching unit (5), comprising: an inductor (51), having a first end for receiving a radio frequency signal, and a second end electrically connected to the signal feeding point (311); and A capacitor (52) has a first end electrically connected to the second end of the inductor (51), and a second end electrically connected to the ground plane (2). 10. An antenna combination comprising: a ground plane (2), used to provide a reference ground potential, and includes two edges (21, 22); Two radiation units (3) according to claim 9 are spaced adjacent to these edges (21, 22) respectively, and these radiation units (3) are mutually mirror-symmetrical to a mirror line (7), and are respectively aligned with the mirror image The lines are separated by a distance, and these edges (21, 22) are respectively located on two opposite sides of the mirror image line (7); The impedance adjustment chip (4) according to two claims 9 is electrically connected to the radiation units (3) respectively; and The two input matching units (5) described in claim 9 are electrically connected to the radiation units (3) respectively.